TSM server fail to scan the PC terminals

After finish TSM deploying and open TSM scanner function to scan TSM Agnet installed PC, but some PC cannot be found .

Alarm Information

NONE

Handling Process

1. Ping from TSM server to PC ,it is alive .
2. There is no physical firewall device on this route.
3. Checking the software firewall in PC , I find that Windows OS pre-installed firewall is ON,
after close it , I find the rest PC terminals .

Root Cause

1.the route from TSM server to pc is not reachable .
2.firewall exists between TSM and PC terminals

Suggestions

When some PC cannot be found by TSM server ,try to check route and firewall configuration along the route .